JP5163289B2 - Powder rolling equipment - Google Patents

Description

  The present invention relates to a powder rolling apparatus for producing a sheet material by rolling a powder between rolling rolls.

Conventionally, for example, the powder rolling apparatuses described in Patent Document 1 and Patent Document 2 are known as powder rolling apparatuses that can obtain a thin sheet material without fluctuation in thickness.
The powder rolling apparatus has a preliminary reduction roll that preliminarily reduces the powder between one of a pair of rolling rolls, thereby rolling the powder to a thickness thinner than the thickness corresponding to the biting angle of the rolling roll. Therefore, a sheet material thinner than the conventional one can be manufactured stably. One feature of the pre-rolling roll is that it has a smaller diameter than the rolling roll in order to make the biting angle smaller than the biting angle between the rolling rolls.
JP 2002-212608 A JP 2005-139536 A

  In recent years, there has been a demand for manufacturing a thin sheet material having a large width, and accordingly, a powder rolling apparatus having a large width of a rolling roll and a pre-rolling roll has been used. However, since the pre-rolling roll has a small diameter, when it becomes wide, bending easily occurs due to the load during pre-rolling, and the distance between the rolling roll and the pre-rolling roll changes, and the thickness is uniform. In the width direction, there is a problem in that a sheet material having a thickness at the center portion that is thicker than that at both end portions is produced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a powder rolling apparatus capable of obtaining a thin sheet material having a wide width and a uniform thickness.

In order to solve the above-mentioned problems, the present invention is a powder rolling device comprising a rolling roll for rolling powder and a pre-rolling roll for pre-rolling the powder between the rolling rolls, wherein the pre-rolling A configuration is adopted in which a backup device that suppresses deformation of the pre-rolling roll is provided.
By employ | adopting such a structure, the bending of the preliminary reduction roll by preliminary reduction can be suppressed, and the distance between a rolling roll and a preliminary reduction roll can be stabilized.

Moreover, in this invention, the said backup apparatus employ | adopts the structure that it is provided so that the said pre-rolling roll may be supported from the paying-out direction side which carries out the said pre-rolling and discharges | emits the said powder.
By adopting such a configuration, it is possible to suppress the bending of the preliminary reduction roll by supporting the preliminary reduction roll from the paying-out direction side where bending is likely to occur.

Moreover, in this invention, the said backup apparatus employ | adopts the structure that it is provided so that the axial direction center part of the said pre-rolling roll may be supported at least.
By adopting such a configuration, it is possible to suppress the bending of the central portion in the axial direction of the pre-rolling roll that is likely to generate a large bending.

Moreover, in this invention, the contact part of the said backup apparatus contact | abutted with the surrounding surface of the said pre-reduction roll employ | adopts the structure that a friction coefficient is lower than the surrounding surface of the said pre-reduction roll.
By adopting such a structure, the rotational coefficient of the pre-rolling roll is reduced by providing the contact portion with a fluororesin material made of, for example, Teflon (registered trademark) having a lower coefficient of friction than the peripheral surface of the pre-rolling roll. Can be made smooth without hindering. In addition, for example, by providing a ceramic material made of hard alumina, silicon carbide, or the like at the contact portion, it can be made smooth without hindering the rotational movement of the pre-rolling roll, and is resistant to sliding contact heat and the like. Can be provided with sex.

Moreover, in this invention, the said backup apparatus employ | adopts the structure of having a backup roll which contact | abuts with the said pre-rolling roll.
By adopting such a configuration, by supporting the preliminary reduction roll by the backup roll, a predetermined rotational movement can be smoothly performed without hindering the rotational movement of the preliminary reduction roll.

Moreover, in this invention, the said backup apparatus employ | adopts the structure of having a backup block which contact | abuts with the said pre-rolling roll.
By adopting such a configuration, it is not necessary to provide a rotation mechanism like a backup roll, so that the cost can be reduced.

Moreover, in this invention, the said backup apparatus employ | adopts the structure of having the removal apparatus which removes the said powder adhering to the said pre-rolling roll.
By adopting such a configuration, the powder adhering to the preliminary reduction roll suppresses the deflection of the preliminary reduction roll and the sliding scratches on the peripheral surface caused by biting between the backup device and the preliminary reduction roll, The distance between the pre-rolling roll and the rolling roll can be accurately maintained.

According to the present invention, there is provided a powder rolling apparatus comprising a rolling roll for rolling powder and a pre-rolling roll for pre-pressing the powder between the rolling rolls, and the deformation of the pre-rolling roll due to the pre-rolling By adopting the configuration of having a backup device that suppresses the above, it is possible to suppress the deflection of the preliminary reduction roll due to the preliminary reduction, and it is possible to stabilize the distance between the rolling roll and the preliminary reduction roll.
Therefore, according to the present invention, it is possible to produce a thin sheet material having a wide width and a uniform thickness.

(First embodiment)
Hereinafter, a first embodiment of a powder rolling apparatus and a powder rolling method of the present invention will be described with reference to FIG.
FIG. 1 is a schematic configuration diagram of a powder rolling apparatus 1 according to the first embodiment.
The powder rolling apparatus 1 includes a pair of rolling rolls 4A and 4B arranged in parallel and horizontally, and a hopper 3A that is disposed above one rolling roll 4A and supplies metal powder (powder) 2 via a belt feeder 5A. , A preliminary reduction roll 7A for preliminary reduction of the metal powder 2 between the rolling roll 4A and a backup device 10 for suppressing the deflection of the preliminary reduction roll 7A are provided. A sheet guide (not shown) for guiding the formed sheet material to the next process is provided.

  The rolling rolls 4A and 4B are controlled so as to be independently rotatable and synchronously rotated at the same speed. In some cases, the sheet material is controlled to rotate at different constant speeds in order to apply a shearing force to the sheet material. Further, the gap between the rolling rolls 4A and 4B is adjustable, and the thickness of the rolled sheet material can be arbitrarily changed.

  The hopper 3A has a hollow structure that gradually decreases in diameter as the cross-sectional shape goes downward, stores the metal powder 2, and passes the metal powder toward the peripheral surface of the rolling roll 4A via a belt feeder 5A connected to the bottom. 2 is supplied.

  The belt feeder 5A is provided at the bottom of the hopper 3A, and is configured to convey the metal powder 2 from the hopper 3A by being connected to a rotation driving mechanism (not shown) and driven to rotate. Further, the belt feeder 5A is configured such that the conveyance destination is located above the rolling roll 4A and the metal powder 2 is supplied onto the peripheral surface of the rolling roll 4A. Furthermore, the belt feeder 5A has substantially the same width as the width of the rolling roll 4A, and can supply the metal powder 2 uniformly over the width direction of the rolling roll 4A.

  The pre-rolling roll 7A is formed to have a diameter smaller than that of the rolling roll 4A (and 4B), specifically, 20% or less of the diameter of the rolling rolls 4A and 4B, and the rotation center thereof is the rotation of the rolling roll 4A. It is installed in the position of angle (theta) 1 from the perpendicular direction upper direction to the rolling roll 4B side with respect to the center. The installation angle θ1 can be selected from 0 ° to 85 °, but here, θ1 = 30 °. Moreover, the unevenness | corrugation is formed in the outer peripheral surface of the pre-rolling roll 7A, and it is easy to bite the supplied metal powder 2. The unevenness may be uniform or non-uniform. Further, depending on the properties of the metal powder 2, a flat roll having a smooth outer peripheral surface may be used. Further, instead of a flat roll, a roll having a concave crown or a convex crown may be used. The peripheral surface of such a pre-rolling roll 7A is made of stainless steel, for example.

  The pre-rolling roll 7A is provided with a rotation mechanism (not shown), and can be adjusted independently to an arbitrary rotation speed (circumferential speed) with respect to the rolling rolls 4A and 4B. The axial distance between the pre-rolling roll 7A and the rolling roll 4A can be arbitrarily adjusted, and therefore the gap between these rolls can be finely adjusted.

  The backup device 10 includes a backup roll 11 that comes into contact with the preliminary reduction roll 7A, and a brush roll (removal device) 12 that removes the metal powder 2 attached to the preliminary reduction roll 7A.

The backup roll 11 is rolled from a straight line 20 connecting the rotation center of the pre-rolling roll 7A and the rotation center of the pre-rolling roll 7A. Specifically, it is arranged so that the peripheral surface of the backup roll 11 and the peripheral surface of the pre-rolling roll 7A are in contact with each other so as to support from the side where the roll 4B is provided. Further, the backup roll 11 has substantially the same width as that of the preliminary reduction roll 7A, is formed with a larger diameter than the preliminary reduction roll 7A, and extends in the width direction (the direction perpendicular to the paper surface in FIG. 1). It is configured to be supported so as to be rotatable around the rotation axis.
Note that the backup roll 11 is configured such that the installation position can be adjusted in accordance with the adjustment of the interaxial distance between the preliminary reduction roll 7A and the rolling roll 4A.

The brush roll 12 is disposed below the backup roll 11 and at a position where a brush, which is a raised fiber provided on the peripheral surface, abuts on the peripheral surface of the pre-rolling roll 7A. Further, the brush roll 12 has substantially the same width as that of the preliminary reduction roll 7A, is provided with a rotation mechanism (not shown), and is independently driven to rotate at an arbitrary rotational speed with respect to the preliminary reduction roll 7A. It is configured to do.
Note that the brush roll 12 has a configuration in which the installation position can be adjusted in accordance with the adjustment of the inter-axis distance between the preliminary reduction roll 7A and the rolling roll 4A, similarly to the backup roll 11.

Then, operation | movement of the powder rolling apparatus 1 of said structure is demonstrated along the procedure which manufactures a sheet | seat material.
First, the powder rolling device 1 extends the metal powder 2 stored in the hopper 3A toward the circumferential surface of the rolling roll 4A through the belt feeder 5A connected to the bottom of the hopper 3A, in the width direction of the rolling roll 4A. Supply continuously.
The metal powder 2 supplied on the rolling roll 4A is preliminarily rolled between the pre-rolling roll 7A and the rolling roll 4A. Here, since the pre-rolling roll 7A has a smaller diameter than the rolling roll 4A and the contact arc length is small, less metal powder is drawn, and as a result, compared with the case of rolling between the rolling rolls 4A and 4B. It can be rolled thinly.

At this time, the pre-rolling roll 7A is subjected to a load that causes the metal powder 2 to bend in the discharge direction by pre-rolling the metal powder 2 with the rolling roll 4A, but is discharged by the backup roll 11 over the entire width. Since it is supported from the direction side, bending can be suppressed, and the distance to the rolling roll 4A is constant and stable over the width direction. Further, since the backup roll 11 is supported so as to be rotatable about a rotation axis extending in the width direction, the backup roll 11 can be rotated from the circumferential surface that comes into contact with the circumferential surface of the preliminary reduction roll 7A without hindering the rotational movement of the preliminary reduction roll 7A. It will rotate by receiving a force from the pre-rolling roll 7A.
The metal powder 2 is deaerated by being preliminarily rolled between the pre-rolling roll 7A and the rolling roll 4A, and the metal powder 2 having a constant density and a constant thickness is quantitatively determined, and the rolling rolls 4A and 4B. Will be supplied in between.

  Here, a part of the metal powder 2 that has undergone preliminary reduction may adhere (stick) to the peripheral surface of the preliminary reduction roll 7A in a state where the relative speed is substantially zero. The metal powder 2 adhering to the preliminary reduction roll 7A is wiped off by the brush roll 12 that rotates clockwise at a predetermined rotational speed, and the metal powder 2 is bitten between the preliminary reduction roll 7A and the backup roll 11 It will be prevented from being inserted.

And the rolling rolls 4A and 4B are inserted between the metal powder 2 supplied between the rolling rolls 4A and 4B and the rolling rolls 4A and 4B from the upper side to the lower side by being rotationally driven at a predetermined distance. The sheet-like metal plate 21 is rolled. By the rolling, the metal powder 2 is fixed to the metal plate 21 to form a thin sheet material having a wide width and a uniform thickness.
The sheet material rolled to a desired thickness between the rolling rolls 4A and 4B is sent to the next process (for example, a sintering process) along the sheet guide. Even if the irregularities formed on the outer peripheral surface of the pre-rolling roll 7A are transferred to the sheet material, the surface shape of the pre-rolling roll 7A is the same as that of the sheet material because it is formed smoothly by rolling with the rolling rolls 4A and 4B. Does not affect surface gloss.

Therefore, according to 1st Embodiment of this invention mentioned above, powder provided with rolling roll 4A, 4B which rolls the metal powder 2, and pre-rolling roll 7A which pre-rolls the metal powder 2 between the rolling rolls 4A. By adopting a configuration in which the rolling device 1 includes a backup device 10 that suppresses deformation of the preliminary reduction roll 7A due to the preliminary reduction, the bending of the preliminary reduction roll 7A due to the preliminary reduction can be suppressed. The distance between the roll 4A and the pre-rolling roll 7A can be stabilized.
Therefore, according to the first embodiment of the present invention, there is an effect that a thin sheet material having a wide width and a uniform thickness can be manufactured.

  Further, in the first embodiment, the backup device 10 adopts a configuration in which the preliminary reduction roll 7A is provided so as to be supported from the discharge direction side where the preliminary reduction is performed and the metal powder 2 is discharged, so that the bending is prevented. By supporting the pre-rolling roll 7A from the discharge direction side that is likely to occur, the bending of the pre-rolling roll 7A can be suppressed.

  Moreover, in 1st Embodiment, the backup apparatus 10 employ | adopts the structure that it is provided so that the preliminary reduction roll 7A may be supported over the full width, and suppresses the bending of the preliminary reduction roll 7A over the full width direction. be able to.

  Moreover, in 1st Embodiment, the backup apparatus 10 employ | adopts the structure that it has the backup roll 11 which contact | abuts with the preliminary reduction roll 7A, By supporting the preliminary reduction roll 7A by the backup roll 11, a preliminary reduction roll The predetermined rotational motion can be smoothly performed without hindering the rotational motion of 7A.

  Moreover, in 1st Embodiment, the backup apparatus 10 employ | adopts the structure of having the brush roll 12 which removes the metal powder 2 adhering to 7 A of preliminary reduction rolls, and the metal powder 2 adhering to 7 A of preliminary reduction rolls is obtained. Suppression of bending of the pre-rolling roll 7A and sliding scratches on the peripheral surface due to biting between the backup roll 11 and the pre-rolling roll 7A is suppressed, and the distance between the pre-rolling roll 7A and the rolling roll is accurately determined. Can keep.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, description of the part which has the same structure as 1st Embodiment is omitted.
FIG. 2 is a schematic configuration diagram of the powder rolling apparatus 1 according to the second embodiment.
The backup device 10 provided in the powder rolling device 1 according to the second embodiment includes a backup block 13 that contacts and supports the preliminary reduction roll 7A, and supports the backup block 13 and the backup block 13 with the preliminary reduction roll 7A. It is comprised from the support member 14 positioned in the position which touches.

The backup block 13 has a width substantially the same as the width of the pre-reduction roll 7A and is disposed on the discharge direction side. The abutment portion 13a that contacts the pre-reduction roll 7A has substantially the same curvature as the circumference of the pre-reduction roll 7A. And has a configuration in which the contact area is increased and the area for supporting the pre-rolling roll 7A is increased by being in close contact with the pre-rolling roll 7A. Further, since the abutting portion 13a is a portion in sliding contact with the preliminary reduction roll 7A, in order to avoid wear of the peripheral surface of the preliminary reduction roll 7A due to sliding with the preliminary reduction roll 7A, the hardness is lower than that of the preliminary reduction roll 7A. It is preferable that it is comprised from these members. With such a configuration, it is possible to prevent deformation of the peripheral surface due to wear of the pre-rolling roll 7A. Further, the contact portion 13a is formed or coated with a low friction fluororesin material such as Teflon (registered trademark) having a lower friction coefficient than the peripheral surface of the preliminary reduction roll in order to smoothly rotate the preliminary reduction roll 7A. Are preferably equal. In addition, if the contact portion 13a is formed of a ceramic material made of hard alumina, silicon carbide, or the like, it can withstand higher sliding contact heat generated between the pre-rolling roll 7A.
The support member 14 is a long member that is substantially square when viewed from the front and extends in the width direction, and is configured such that the backup block 13 is connected to the lower surface. Further, the support member 14 has a configuration in which the installation position of the backup block 13 can be adjusted in accordance with the adjustment of the interaxial distance between the preliminary reduction roll 7A and the rolling roll 4A.

Next, the operation of the backup device 10 configured as described above will be described.
The metal powder 2 supplied onto the rolling roll 4A by the hopper 3A and the belt feeder 5A is preliminarily rolled between the pre-rolling roll 7A and the rolling roll 4A.
At this time, the pre-rolling roll 7A receives a load that causes the metal powder 2 to bend in the discharge direction, but is supported from the discharge direction side by the backup block 13 over the entire width, so that the bending is suppressed. The distance to 4A is constant over the width direction and is stable. Further, since the contact portion 13a of the backup block 13 is formed of a low-friction fluororesin material, it is possible to reduce a decrease in the efficiency of the rotational motion of the preliminary reduction roll 7A due to sliding.
In addition, a part of the metal powder 2 that has undergone preliminary reduction may adhere to the peripheral surface of the preliminary reduction roll 7A in a state where the relative speed is substantially zero, but the contact portion 13a is substantially the same as the circumference of the preliminary reduction roll 7A. Since it has a curved surface formed with the same curvature, the metal powder 2 attached to the preliminary reduction roll 7A at the sliding contact start position 15 where the peripheral surface of the preliminary reduction roll 7A and the curved surface of the contact portion 13a begin to slide. And the metal powder 2 is prevented from being bitten between the pre-rolling roll 7A and the backup block 13.

  Therefore, in the second embodiment of the present invention, the backup device 10 can suppress the bending of the preliminary reduction roll 7A due to the preliminary reduction by adopting a configuration in which the backup device 10 has a backup block that comes into contact with the preliminary reduction roll 7A. The distance between the rolling roll 4A and the pre-rolling roll 7A can be stabilized. Moreover, since it is not necessary to provide a rotation mechanism like the backup roll 11, cost reduction can be achieved.

  Further, in the second embodiment, a configuration is adopted in which the contact portion 13a of the backup device 10 that contacts the peripheral surface of the preliminary reduction roll 7A is formed of a fluororesin material having a lower friction coefficient than the peripheral surface of the preliminary reduction roll. Thus, by forming the contact portion 13a from a fluororesin material made of Teflon (registered trademark) or the like having a low friction coefficient, the rotational movement of the preliminary reduction roll 7A can be made smooth. In addition, for example, by providing a ceramic material made of hard alumina, silicon carbide, or the like in the contact portion 13a, it can be made smooth without hindering the rotational movement of the pre-rolling roll 7A, and against sliding heat, etc. Heat resistance.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above embodiment, it has been described that the backup roll 11 and the backup block 13 of the backup device 10 support the preliminary reduction roll 7A over the entire width. However, the present invention is not limited to the above configuration, and the width direction A configuration in which a plurality of parts are partially supported at a predetermined interval may be employed. Further, in the present invention, as in another embodiment shown in FIG. 3, if a configuration is adopted in which it is provided so as to support at least the central portion in the axial direction of the preliminary reduction roll 7 </ b> A, the preliminary reduction roll is likely to generate a large deflection. Therefore, the bending of the pre-rolling roll 7A can be effectively suppressed. FIG. 3 is a modification of the second embodiment, and shows a left side view (the hopper 3A and the belt feeder 5A are not shown) on the side where the rolling roll 4A in FIG. 2 is provided.

  In addition, for example, in the above embodiment, the removal device that removes the metal powder 2 attached to the pre-rolling roll 7A has been described as the brush roll 12, but is not limited to this configuration, for example, the pre-rolling roll 7A A member such as a fixed brush or felt that abuts the circumferential surface in the width direction may be used. Moreover, the structure which provides the suction device which removes the metal powder 2 adhering by suction may be sufficient.

In the first embodiment, if the peripheral surface of the backup roll 11 is coated with a fluororesin material, the rotational movement of the pre-rolling roll 7A can be made smoother. Further, the backup roll 11 may be configured to be connected to a rotational drive mechanism and actively assist the rotation of the pre-rolling roll 7A.
Further, in the second embodiment, as in the first embodiment, a removing device such as a brush roll 12 that removes the metal powder 2 attached to the pre-rolling roll 7A may be provided. In this case, for example, the contact portion 13a of the backup block 13 does not have a curved surface formed with substantially the same curvature as the circumference of the preliminary reduction roll 7A, and there is a gap between the contact portion 13a and the preliminary reduction roll 7A. This is effective because the biting of the metal powder 2 can be prevented.

  Moreover, in the said embodiment, although the powder rolling apparatus 1 demonstrated rolling the metal powder 2 to the single side | surface of the metal plate 21, and forming a sheet | seat material, the hopper 3A, the belt feeder 5A, and preliminary reduction also on the rolling roll 4B side. If the roll 7A and the backup device 10 are provided symmetrically with the rolling roll 4A side, the metal powder 2 can be rolled across the entire surface of the metal plate 21 to form a three-layer sheet material. .

  In the above embodiment, the powder rolling device 1 has been described as rolling the metal powder 2 and the metal plate 21 with the rolling rolls 4A and 4B. However, the metal plate 21 is not essential for forming the sheet material, and the metal plate 21 is used. The structure which does not use may be sufficient.

It is a schematic block diagram of the powder rolling apparatus in 1st Embodiment of this invention. It is a schematic block diagram of the powder rolling apparatus in 2nd Embodiment of this invention. It is a schematic block diagram of the backup device in another embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Powder rolling apparatus, 2 ... Metal powder (powder), 4A, 4B ... Roll, 7A ... Pre-rolling roll, 10 ... Backup device, 11 ... Backup roll, 12 ... Brush roll (removal device), 13 ... Backup block , 13a ... contact portion

Claims (5)

A powder rolling device comprising a rolling roll for rolling powder, and a pre-rolling roll for pre-rolling the powder between the rolling rolls,
Powder rolling apparatus characterized in that it comprises a backup device comprising a suppressing backup blocks the deformation of the preliminary rolling roll according to the preliminary rolling in the preliminary rolling roll abuts.   2. The powder rolling apparatus according to claim 1, wherein the backup device is provided so as to support the preliminary reduction roll from the discharge direction side of the preliminary reduction to discharge the powder.   3. The powder rolling apparatus according to claim 1, wherein the backup device is provided so as to support at least an axial center portion of the preliminary reduction roll. 4.   The powder according to any one of claims 1 to 3, wherein the contact portion of the backup device that contacts the peripheral surface of the preliminary reduction roll has a lower coefficient of friction than the peripheral surface of the preliminary reduction roll. Rolling equipment. The powder rolling device according to any one of claims 1 to 4 , wherein the backup device includes a removing device that removes the powder adhering to the pre-rolling roll.

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